Carburetor



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A! AE-TBERL? AL CARBURETOR Filed Jan. 14 1920 2 Shee-ts-Sheet 2 city of Toronto fuels it is extremely desirable that a car- Patented July 10, 1923.

lAfiLli ADOLF AEBERLI, OF TORONTO, ONTARIO, AND 'WILI-IELM DREYER, OF LAGHINE,

QUEBEC,

CANADA.

OARBURETOR.

Application filed January 14, 1920.

To all whom it may concern:

Be it known that we, AnoLr 'AEBERLI and WILHELM DREYER, citizen of the Swiss Republic and subject of the King of Great Britain, respectively, and residents of the Province of Ontario, Dominlon of Canada, and town of Lachine, Province of Quebec, Dominion of Canada, respectively, have invented certain new and useful Improvements in Carburetors, described in the following specification and illustrated in the accompanying drawings, that form part of the same.

The principal objects of this invention are ,to enable successful use of low grade fuels in internal combustion engines, and to provide means for delivering a priming charge of high grade fuel to the engine and automatically changing from the high grade to the low grade fuel.

The principal feature of the invention consists in the novel construction and arrangement of parts, whereby a supply of high grade fuel is first conducted to the carburetor to effect the starting of the engine and upon the starting of the engine a supply of low grade fuel is conducted to the carburetor and the supply of high grade fuel is simultaneously cut of, the operation being automatically effected by'the operation of a valve controlled by the pressure f the engine exhaust, and whereby the high grade fuel connection is reestablished upon the stopping of the engine.

A further important feature consists in interposing a heating medium in the path of'flow of the air and fuel mixture through the carburetor.

In the drawings, Figure 1- is a plan view of our improved carburetor.

Figure 2 is a vertical sectional view through the line a-a of Figure 1.

Figure 3 is an elevational view of the carburetor from the intake side indicated by the letter A in Figure 1, the lower portion of the device being shown partly in mid-section.

Figure 4 is a vertical sectional view through the line b-b of Figure 1.

Owing to the high cost of high grade buretor be produced which will be capable of effecting the successful carburation of 1 low grade fuels.

To accomplish this result it is necessary Serial No. 351,426.

that the temperature of the low grade fuel be raised prior to its entering the cylinder and it is also necessary that means be provided for starting the engine in order that it may become heated before the low grade fuel is introduced, so as to avoid condensation and failure to produce an explosive mixture.

In order to obtain this result we have constructed a carburetor in which the body portion 1 is formed with a substantially U-shaped passage 2, ne end of which terminates in the air inlet opening 3, and the other end terminates in the gas discharge opening 4. The regular control throttle 5 is arranged in the discharge opening a and a butterfly valve 6 is arranged in the inlet passage to choke the supply of air to the carburetor for the purpose of starting.

The body 1 is provided with a threaded cylindrical portion 7 extending downwardly from the bottom of the U-shaped passage 2 and in this threaded extension is secured the valve plug 8.

The plug is threaded into the cylindrical extension and is provided with an annular shoulder 9 against which the sheet metal cup 10 which forms the inner and high grade fuel chamber is clamped, the upper edge of the cup being held secured to the underside of the circular flange 11 formed on the body 1.

The outer cup 12 is arranged upon the outer end of the valve plug and both cups are clamped against a spacing member 12 in a fluid 13, the upper edge of the outer cup engaging the flange 11 in a fluid tight joint.

The plug 8 and spaced 12' are formed with a transverse passage 14 connecting with the interior of the outer cup 12 and a central passage 15 leads to the needle valve orifice 16 which is offset from the centre and connects with a cup like depression 17 in the top end of the valve plug, which forms the bottom of the U passage 2 in the body.

A transverse hole 18 through the plug 8 connects with the interior of the inner cup 10 and leads to the vertical needle valve orifice 19 connecting with a cup depression 20 arranged beside the depression 17 in the top of the plug.

Needle valves 21 and 22 control the orifices 16' and 19 respectively, being threaded into the body l from the top. These may be regulated to control thevolume of fuel" to the carburation chamber.

At the outlet side of the carburation chamber is arranged-a heating-chamber 23 which extends transversely of the rimofthe passage 2 and a baflie wall 24: directs.

the flow of gas upwardly. Extending transversely across the chamber23 isa .tubeze preferably of copper connected with the engine exhaustby, apipe 27 and presenting a ..l1eating surface: against which the fuel ladenlair passing through-the carburetor is directed. plurality of'tubes-may beused Within the cups l0 and 12 are arranged the'fioats29 and 30 supported on pivot sue-- pensions '31. and; 32 respectivcly. At the side:opposife tonthe pivot suspension of eaclrjfioat is arranged flnllGQCllfi valve, the valve .33}on: the float 29 controlling the inlet of fuel to the inner "cup which'enters wrought. passage 34 and the valve '35 on the..float 30 controlling the inlet of fuel toiftheiou'ter cup. through the passage 86.

The passage. 34. connects with. a passage 37; inilthe. body '1 which leads from the highIgradeQ fuel supply connection 88 and theipassage .36 connectsawithuapassage 39 arranged parallel withthe-passzige 37 and leads frorn'th'e low grade fuel supply connection. A0. n v

The passagefi'fis intersected by acylindrioal chamber elfwhichextends past the passagje 39 to:the chamber tl. which extends past the passa'ge89 to the chamber 42at the endlofthe exhaust heater tube 25; Withidthechamber 4:1 isv arranged'a piston valve 43 which is formedwith aredu'c'ed portion. 441. the. outer end and. a reduced portions?)intermediate of itsv length. I

The intermediateportion 46 is so arranged that it closes. the low grade fuel passage 39lwhenflthe high grade. fuel passag' 37 is'wide open and it is normally held in this position by a coil. compression s rings? .1 The hi'ghjgrade "fuelpassage to the5cup 10 "isthus openrandthe high grade fuel feeds through the passage 19.. for starting andl the low grade passage is closed.

When the engine islstarted. the-P of the exhaust passing.. throughi the= heat tube 25" to"th'e chamberLQ' moves the ey be preheated if lindrical valve against the..spring -4t7 .and gradually shuts off the high grade =-fuel supply, the reduced end 44: acting against an ail" cushion in the plug AC8, Simultaneously it opensthe passa'ge'39" allowing the-lowgrade fuel to feed to the cup 12 and ..to..the valve orifice 16. The tWo grades of fuel mix in the bottom of the carburetion. chamber. untilthe high grade fuel ceases to flow through the piston valve 43 cutting off the supply. The engine-will thenhave attained a running. speed and thefuel is wellt-heated and satisfactory; carbura-tion of K theheavyfuel is. accoms' Immediately uponthe stopping of the?- engine the exhaust-1 pressurewiswreleased .--and'.- the spring l'ireturnsthe valve l3 tor-Hora malcutting off the low grade fuelxand op ening .thehigh; grade-supplyready 1 for plished.-

again starting;

A v carburetor such asadescribed aCCeIIL-I plishes a long be understood ,that m'any; of the pdetails may be altered without .departingifrom the".

essential: features W hat. we claim as our inventiorn 15 desired. result. and it must 5 1.- In a-ca-rburetor, thecombinationnwithg.

the-engine enhaustgof a-high, g-radevfuel sup? P y,

to cutoff the high gradec fuel a supply and a low grade fuel supply, ar-valveradapted open thelow gradeesupply, andzmeans-zoonnected w th thaengme-exhaust for eonduct- 1I1g-BXllt1lSl3 pressure to actuate-said valve- 2, I In a. carburetor, a, high, grade fuel=supply, a low grade fuel supply,- .a-cyli-nd rical: passage intersecting ;saidfuel-ssuppli 1 piston valve operating.- in said! cylinder: and

intercepting the flow Of Olle iElleli while freer A ingithe flow of thdothergancl means for. conducting the exhaust pressure from the:

engine to: said cylinder.

A carburetor h-avingtwoseparate fuel-l.

chambers, a carburation chamber connected with said separate chambers,- separate spassages-leading to said chambers, aepistonvalve intercepting said separate passages adapted to cut off one of said passages and simultaneously open the! other, a pressure chamber atone end of-said valve-connectreturning the. valve to normal; following the =cessation of the. exhaust pressure;

4. Ari-carburetor having a carbu-ration chamber, a=pair of jetswvopeningi-into said: chamber, separate fuel' chambers connectedwlth each of said jets, float Vfl1VeS'-lB 6B.Chg

ofsa-id chambers, separate fueli supplygpassages leadingfto said ehambers,- a" cylindrical. passage 1nter-sect1'n-g ,both of said passagesaa piston valve operating in said cylindrical pas sage andfhaving passages-,.therein arranged a so that. one of said fuel passages is-wopen u while the other is closed, QIldwOIlQH-OPQDSL while the ,otherr closes, a pressure chamber 1 and separate passages arranged at one end of said cylindrical passage connected with the engine exhaust, and a compression spring at the opposite end of said piston valve adapted to return the piston upon the cessation of the exhaust.

5. A. carburetor comprising, a body having a cupped carburation chamber, a plug removably secured in the bottom of said chamber, said plug having a pair of jets thereto, valves adustably arranged in said body to regulate said jets, a pair of cups one arranged Within the other and secured to said plug, float valves arranged in said cups, passages in said body leading separately to said cups, and a piston valve interposed in said passages adapted to cut off the fuel supply to one cup and simultaneously open the supply to the other.

ADOLF AEBERLI. 'WILHELM DREYER. 

